Lee Bom-yi (Choi Sooyoung) was once a terminally ill patient, but she's been given a second chance at life after getting a heart transplant and now lives each day to the fullest. She meets Kang Dong-ha (Kam Woo-sung), the CEO of Hanuiron and a widower with two children who lost his wife to an accident. Bom-yi falls for Dong-ha, not knowing that her donor was Dong-ha's wife.